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楼主 |
发表于 2019-3-22 16:33:56
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主机SPI配置
void SPI2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
SPI2_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //éèÖÃSPIμ¥Ïò»òÕßË«ÏòμÄêy¾YÄ£ê½:SPIéèÖÃÎaË«ÏßË«Ïòè«Ë«1¤
SPI2_InitStructure.SPI_Mode = SPI_Mode_Master; //éèÖÃSPI1¤×÷Ä£ê½:éèÖÃÎaÖ÷SPI
SPI2_InitStructure.SPI_DataSize = SPI_DataSize_8b; //éèÖÃSPIμÄêy¾Y′óD¡:SPI·¢Ëí½óêÕ8λ֡½á11
SPI2_InitStructure.SPI_CPOL = SPI_CPOL_High; //Ñ¡ÔñáË′®DDê±ÖóμÄÎèì¬:ê±ÖóDü¿Õ¸ß
SPI2_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //êy¾Y2¶»ñóúμú¶t¸öê±ÖóÑØ
SPI2_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSSDÅoÅóéó2¼t£¨NSS1ü½Å£©»1êÇèí¼t£¨ê1óÃSSI룩1üàí:Äú2¿NSSDÅoÅóDSSIλ¿ØÖÆ
SPI2_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //¶¨òå2¨ìØÂêÔ¤·ÖÆμμÄÖμ:2¨ìØÂêÔ¤·ÖÆμÖμÎa256
SPI2_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //Ö¸¶¨êy¾Y′«êä′óMSBλ»1êÇLSBλ¿aê¼:êy¾Y′«êä′óMSBλ¿aê¼
SPI2_InitStructure.SPI_CRCPolynomial = 7; //CRCÖμ¼ÆËãμĶàÏîê½
SPI_Init(SPI2, &SPI2_InitStructure); //¸ù¾YSPI_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèSPIx¼Ä′æÆ÷
SPI_Cmd(SPI2, ENABLE); //ê1ÄüSPIíaéè
SPI2_ReadWriteByte(0xff);//Æô¶ˉ′«êä
}
从机SPI配置
void SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_SPI1, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);
//éèÖà A43éÎa′ó»úSPIí¨DÅμÄÆ¬Ñ¡1ü½Å£¬ÎòÃÇÔú3õê¼×îoó¸øËû±ä3é0¾í¿éòÔáË£¬ÕaÑù±íê¾Ñ¡ÖDÎa′ó»ú
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//100MHz
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_4);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //éèÖÃSPIμ¥Ïò»òÕßË«ÏòμÄêy¾YÄ£ê½:SPIéèÖÃÎaË«ÏßË«Ïòè«Ë«1¤
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave; //éèÖÃSPI1¤×÷Ä£ê½:éèÖÃÎa′óSPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //éèÖÃSPIμÄêy¾Y′óD¡:SPI·¢Ëí½óêÕ8λ֡½á11
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //Ñ¡ÔñáË′®DDê±ÖóμÄÎèì¬:ê±ÖóDü¿Õ¸ß
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //êy¾Y2¶»ñóúμú¶t¸öê±ÖóÑØ
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSSDÅoÅóéó2¼t£¨NSS1ü½Å£©»1êÇèí¼t£¨ê1óÃSSI룩1üàí:Äú2¿NSSDÅoÅóDSSIλ¿ØÖÆ
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //¶¨òå2¨ìØÂêÔ¤·ÖÆμμÄÖμ:2¨ìØÂêÔ¤·ÖÆμÖμÎa256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //Ö¸¶¨êy¾Y′«êä′óMSBλ»1êÇLSBλ¿aê¼:êy¾Y′«êä′óMSBλ¿aê¼
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRCÖμ¼ÆËãμĶàÏîê½
SPI_Init(SPI1, &SPI_InitStructure); //¸ù¾YSPI_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèSPIx¼Ä′æÆ÷
SPI_Cmd(SPI1, ENABLE); //ê1ÄüSPIíaéè
GPIO_ResetBits(GPIOA,GPIO_Pin_4); //à-μíPA4
//SPI1_ReadWriteByte(0xff);//Æô¶ˉ′«êä
}
都是移植的MINi板的代码,就SPI_InitStructure.SPI_Mode 就这一位不一样 |
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